GitHub Pull Requests Review

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Pros

Pro

Can reference issue numbers and commits in comments

Because GitHub pull requests are integrated with the rest of GitHub, you can reference parts of your git history in comments. This can be handy if you want to point someone to the historical significance of a piece of code.

Pro

Already integrated with GitHub projects

Pro

Free for Public/Open Source Projects

Cons

Con

Not free for non-open source code

Con

No "acknowledgment" or "mark as reviewed"

The code review process should enforce the code to be reviewed by one or two peers at least to be "accepted" or "reviewed". On github, there is no such thing : no way to be sure that a PR has been reviewed by a certain number of reviewers.